Java year from()方法及实例

Year 类的 from() 方法用于从作为参数传递的TemporalAccessor对象中获取year的实例。TemporalAccessor代表一组任意的日期和时间信息，该方法有助于根据指定的TemporalAccessor对象获得一个年份对象。

语法

public static Year from(TemporalAccessor temporal)

参数： 该方法接受 temporal 作为参数，它是一个temporal对象。它不应该是空的。

返回值 ：该方法返回年份对象。

异常： 该方法抛出以下异常。

• DateTimeException – 如果不能转换为年。

以下程序说明了from()方法：

程序1 :

// Java program to demonstrate
// Year.from() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a temporal object
        LocalDate date = LocalDate.parse("2007-12-03");
  
        // print instance
        System.out.println("LocalDate :"
                           + date);
  
        // apply from method of Year class
        Year year = Year.from(date);
  
        // print instance
        System.out.println("Year get from"
                           + " method: "
                           + year);
    }
}

输出:

LocalDate :2007-12-03
Year get from method: 2007

程序2

// Java program to demonstrate
// Year.from() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // create a temporal object
        LocalDate ins = LocalDate.parse("2018-11-27");
  
        // print instance
        System.out.println("LocalDate :"
                           + ins);
  
        // apply from method of Year class
        Year year = Year.from(ins);
  
        // print instance
        System.out.println("Year get from"
                           + " method: "
                           + year);
    }
}

输出:

LocalDate :2018-11-27
Year get from method: 2018

**参考资料: ** https://docs.oracle.com/javase/10/docs/api/java/time/Year.html#from(java.time.temporal.Temporal)。